Young Marianne Ransom is astonishing for her beauty, intelligence, and courageous spirit, all of which she needs to help her survive as an orphan on the streets of Victorian London. Soon, her trusting naivete leads her to the luxurious mansion of a wealthy duchess. There she gets a strange visit from the ghost of her dead father, a renowned magician with great powers who warns her of a deadly trap. Meanwhile, Marianne discovers her own gift that will have unexpected consequences not only for her, but for those around her: psychic powers.